/Engine/Source/Runtime/Engine/Classes/Kismet/KismetStringLibrary.h
String functions. Concatenates two strings together to make a new string
A new string which is the concatenation of A+B
static [FString](API\Runtime\Core\Containers\FString) Concat_StrStr ( const [FString](API\Runtime\Core\Containers\FString) & A, const [FString](API\Runtime\Core\Containers\FString) & B )